Arizona ROC R-22 House Moving Examination

When elevating a 120-ton two-story wood-frame building, why is a unified hydraulic jacking system with a single central manifold preferred over independently controlled hand jacks?

• AIt allows proportional fluid distribution to maintain a level lift plane and prevent stru…
• BIt increases the maximum lifting speed by eliminating internal fluid friction in individu…
• CIt reduces the total force required to lift the building by multiplying hydraulic pressur…
• DIt allows operators to use jacks of different stroke lengths without requiring safety shu…

Under standard structural moving safety practices, what is the maximum recommended height-to-width ratio for a standard temporary wooden cribbing tower without external guy wires or mechanical stabilization?

• A3:1
• B5:1
• C2:1
• D4:1

A structural mover constructs a standard 2x2 box crib tower using sound 6x6 inch (nominal) hardwood timbers (actual dimensions 5.5 in x 5.5 in). If the allowable compression stress perpendicular to the grain for the wood species is 500 psi, what is the safe working load capacity of the cribbing tower based on the 4 bearing contact points?

• A60,500 lbs (approx. 30.25 tons)
• B121,000 lbs (approx. 60.5 tons)
• C30,250 lbs (approx. 15.1 tons)
• D90,750 lbs (approx. 45.4 tons)

An R-22 contractor is estimating the weight of a single-story 30 ft by 50 ft wood-frame residence with plaster walls, hardwood flooring, and an asphalt-shingled gable roof. Using a standard structural moving rule of thumb of 60 lbs per square foot of floor area for plaster wood-frame construction, what is the total estimated weight of the house frame?

• A90,000 lbs (45 tons)
• B150,000 lbs (75 tons)
• C60,000 lbs (30 tons)
• D120,000 lbs (60 tons)

A house moving crew is using four hydraulic rams to lift a total building load of 160,000 lbs. Each ram has an effective piston area of 7.07 square inches. Assuming the weight is equally distributed among all four rams, what hydraulic pressure (PSI) must the pump supply to hold the load?

• A5,658 PSI
• B22,631 PSI
• C3,536 PSI
• D11,315 PSI

A steel needle beam supports a concentrated point load of 30,000 lbs at the center of a 20-foot span between support cribs. What is the maximum bending moment induced in the beam by this load?

• A150,000 lb-ft
• B300,000 lb-ft
• C600,000 lb-ft
• D75,000 lb-ft

If a steel needle beam experiences a maximum bending moment of 180,000 lb-ft (2,160,000 lb-in) and the allowable bending stress for ASTM A36 steel in temporary loading is 24,000 psi, what is the minimum required Section Modulus (S) of the steel beam?

• A90.0 in³
• B7.5 in³
• C180.0 in³
• D45.0 in³

What is the primary function of cross beams (runner beams) when placed beneath needle main beams during a structural move?

• ATo collect loads from multiple needle beams and transfer them onto transport dollies or c…
• BTo prevent lateral expansion of exterior foundation walls during lift setup.
• CTo serve as temporary diagonal bracing for the roof truss assemblies.
• DTo attach the hydraulic steering rams directly to the floor joists.

A house mover uses 4 transport dollies to move an 80-ton building structure. Each dolly is equipped with 4 dual-wheel axles (8 tires per dolly). What is the average load supported by each individual tire?

• A5,000 lbs
• B10,000 lbs
• C20,000 lbs
• D2,500 lbs

Why are multi-axle heavy transport dollies designed with interconnected hydraulic suspension cylinders (hydraulic equalization)?

• ATo automatically distribute weight evenly across all tires when traveling over uneven roa…
• BTo allow individual wheels to lock automatically if a tire blowout occurs.
• CTo increase the towing speed of the transport tractor beyond highway limits.
• DTo eliminate the need for steering linkages on rear dollies.

When preparing a two-story wood-frame building with large window openings for a move, what structural reinforcement is standard practice to prevent lateral racking?

• AInstalling diagonal wood bracing or steel cable X-bracing across major wall frames and op…
• BFilling window voids with solid concrete masonry units prior to lifting.
• CWelding vertical steel channels to the exterior siding panels.
• DApplying polyurethane spray foam to all interior drywall corners.

Why are dense hardwoods (such as oak) preferred over softwoods (such as pine) for temporary bearing cribbing timbers directly under heavy steel beams?

• AHardwoods have significantly higher compressive strength perpendicular to the grain, resi…
• BHardwoods are completely immune to dry rot and fungal decay during long storage periods.
• CHardwoods are much lighter in weight per board foot, making manual handling easier.
• DSoftwoods shatter under hydraulic jacking pressures whereas hardwoods bend elastically.

Which timber defect renders a wooden cribbing member unacceptable for use in load-bearing crib towers under a lifted structure?

• ADeep split or decay spanning across more than one-third of the cross-sectional thickness.
• BMinor surface weathering and discoloration from sunlight exposure.
• CLight end-grain checking less than 1/4 inch deep.
• DPresence of bark remnants on unmachined rounded corners (wane) within 5% of edge width.

What critical safety component must be installed on each hydraulic jack cylinder during structural lifting operations to prevent sudden collapse if a hydraulic supply line ruptures?

• APilot-operated check valve (counterbalance or lock valve) mounted directly on the cylinde…
• BHigh-flow bypass relief valve configured to dump fluid to the reservoir.
• CManual needle valve installed at the central pump unit console.
• DQuick-disconnect coupling without internal shutoff pins.

Before inserting needle beams beneath a floor joist system of a crawlspace house, how should the floor framing be secured to the sill plates?

• AVerify floor joists and rim joists are soundly toe-nailed or strapped to sill plates and…
• BRemove all rim joists so needle beams touch only the interior floor joists.
• CNail 1/2-inch plywood panels directly to the underside of the floor joists across the ent…
• DDisengage all floor joists from exterior girders using hydraulic spreaders.

When moving a building with a full brick veneer exterior, what special structural modification is required along the bottom edge of the brickwork prior to jacking?

• AInstalling continuous steel angle ledgers or carrying channels through-bolted to the floo…
• BRemoving the bottom 4 courses of brick around the entire perimeter and replacing them wit…
• CCoating the entire brick exterior with elastomeric waterproofing paint to hold bricks tog…
• DApplying hydraulic tension cables around the top chimney stack only.

During a synchronized hydraulic lift, what is the maximum recommended height increment to lift the building before shimming and inserting the next layer of wooden cribbing?

• A6 inches (or the height of one timber layer)
• B24 inches
• C18 inches
• D36 inches

A cribbing tower transfers a 40,000 lb load to ground soil with an allowable soil bearing capacity of 2,000 lbs per square foot (PSF). What is the minimum ground contact area required for the mudsills/cribbing pad beneath the crib tower?

• A20 sq ft
• B10 sq ft
• C40 sq ft
• D5 sq ft

How do hydraulic power-steering dollies assist the mover when negotiating sharp 90-degree street intersections during transport?

• ARear dollies can be independently steered by a remote operator to allow crab-steering or…
• BThey automatically disengage all brakes on the inner tires during a turn.
• CThey tilt the building framework sideways by 15 degrees to clear street light poles.
• DThey increase tractor engine horsepower through hydraulic feedback loops.

Why is beam deflection strictly limited (typically L/360 or less) when selecting steel needle beams for supporting plaster-finished buildings?

• AExcessive mid-span beam deflection bends floor joists and causes widespread cracking in i…
• BDeflection causes steel beams to permanently magnetize and interfere with hydraulic senso…
• CDeflection increases the weight of the steel beam by stretching the top flange.
• DDeflection prevents hydraulic jacks from making contact with the crib timbers.

When transferring building weight from needle beams onto temporary crib towers, what timber components are driven between the beam flange and crib timbers to ensure solid bearing?

• AHardwood wedges driven in opposing pairs from opposite sides.
• BSoft pine wood shingles stacked in single directions.
• CCast iron shims coated with heavy lubricating grease.
• DRubber vibration isolator pads without mechanical fasteners.

What is the consequence of failing to align the center of gravity (CG) of an asymmetrical building with the center of lift across hydraulic jacking points?

• AThe heavier side will overload its local jacking points, leading to unbalance, tilting, a…
• BThe hydraulic fluid will overheat and vaporize inside the main manifold.
• CThe building will automatically rotate 180 degrees during transit.
• DThe lighter side will sink into the ground while the heavy side rises.

When setting up carrying girders on transport dollies, what geometric configuration provides the highest lateral roll stability during road transport?

• AMaximizing the lateral stance (track width) between left and right dollies under the main…
• BPlacing all dollies directly along the centerline axis of the building.
• CPositioning dollies in a tight triangular cluster under the center floor joist.
• DMounting dollies at a 45-degree angle to the direction of travel.

What control feature on a multi-port hydraulic jacking manifold allows the operator to shut off fluid flow to individual cylinders that have reached their full extension height?

• AIndividual shut-off needle valves or ball valves dedicated to each output port.
• BA master automatic pressure relief valve set at 10,000 PSI.
• CA variable speed electric motor controller on the hydraulic pump.
• DAn inline air-bleed vent mounted at the reservoir tank.

How must timbers be oriented in alternating layers when constructing a square 2x2 box crib tower?

• AEach successive layer is placed perpendicular (at 90 degrees) to the layer immediately be…
• BAll layers are placed parallel to each other with 1-inch gaps between timbers.
• CTimbers are stacked vertically on their end-grain faces.
• DLayers are rotated at 45-degree angles to form an octagonal spiral.

Why are mechanical threaded lock collars (lock rings) on double-acting hydraulic rams engaged during extended hold periods under a lifted structure?

• AThey provide a positive mechanical lock, allowing the load to be safely held without rely…
• BThey automatically increase hydraulic oil pressure inside the cylinder bore.
• CThey prevent the steel needle beam from sliding laterally along the ram cap.
• DThey reduce the effective weight of the building by transferring load to the atmosphere.

When deep I-beams or wide-flange steel beams (W-shape) are used as long main carrying girders, how is lateral-torsional buckling of the top compression flange prevented?

• ABy installing lateral tie bracing or angle struts between parallel steel girders at regul…
• BBy applying heavy lubricating grease along the top web face.
• CBy heating the steel beam flanges with a torch to relieve internal rolling stress.
• DBy placing hydraulic jacks only at the exact mid-span point.

During foundation detachment prep for a crawlspace home, how are the wooden sill plates disconnected from the existing concrete foundation stem wall?

• AUnbolting anchor bolt nuts and washers or cutting anchor bolts flush with the top of the…
• BChiseling away the top 12 inches of concrete stem wall along the entire foundation perime…
• CUsing hydraulic rams to shear the anchor bolts sideways through the sill plate lumber.
• DSoaking the sill plates in solvent until wood fibers release from the anchor bolts.

Why are heavy unreinforced exterior brick chimneys usually detached and demolished down to floor level prior to lifting and relocating a frame house?

• AUnreinforced masonry chimneys have negligible tensile strength and pose an extreme collap…
• BLocal zoning ordinances require all historic brick chimneys to be pulverized for aggregat…
• CBrick chimneys contain natural magnetic fields that interfere with tractor braking system…
• DLeaving a brick chimney attached reduces the total height clearance requirement.

When preparing a residential house with an attached porch and wood deck for relocation, what step must be taken at the house ledger connection?

• ADetach ledger board fasteners and saw-cut roof extensions to separate the porch framing c…
• BWeld the porch framing directly to the needle main girders.
• CFill the porch crawlspace with compacted gravel to support the deck during movement.
• DLeave the porch attached without bracing to allow it to flex independently during road tr…

According to municipal plumbing codes and demolition practices, how must the building's sanitary sewer lateral be isolated and capped prior to structure removal?

• AExposed at the property line or foundation perimeter, severed, and sealed water-tight wit…
• BCrushed in place with an excavator and covered with topsoil.
• CStuffed with rags and covered with loose gravel.
• DLeft open to allow ground drainage during foundation removal.

What is the correct protocol for isolating the domestic water service line before house demolition or relocation activities begin?

• AShut off the curb stop key valve at the water meter, disconnect the service pipe, and ins…
• BCut the water main inside the basement while under pressure and bend the copper pipe doub…
• CTurn off the main valve inside the house water heater closet only.
• DOpen all interior faucets to drain municipal main pressure before severing.

Who is authorized to disconnect, lock out, and purge the natural gas service meter prior to building moving or demolition?

• AThe serving gas utility company or a licensed qualified technician in accordance with uti…
• BAny member of the house moving crew using standard pipe wrenches.
• CThe local municipal building inspector during the site walk-through.
• DThe transport tractor driver after the house is loaded onto dollies.

What action must be completed regarding electrical utilities before steel needle beams are inserted into a building crawlspace?

• AThe electric utility company must remove the overhead service drop or underground service…
• BThe contractor must switch off all wall light switches inside the building.
• CThe main breaker panel must be wrapped in heavy rubber insulation tape.
• DElectrical wiring may remain energized if needle beams are wrapped in cardboard.

Under OSHA 1926.850(a) (Subpart T Demolition), what must a contractor complete BEFORE initiating any demolition or structural detachment of associated building components?

• AA written engineering survey conducted by a competent person to determine the condition o…
• BA 30-day public notification in the local newspaper.
• CA soil compaction test beneath the adjacent roadway.
• DAn air velocity test of all interior rooms using a velometer.

When demolishing attached multi-story garage structures or masonry additions prior to moving the main house, how must masonry walls be dismantled under OSHA demolition standards?

• ATop-to-bottom, story-by-story, preventing accumulation of excessive debris weight on uppe…
• BBy undermining the bottom brick course to allow the wall to collapse as a single unit.
• CBottom-to-top, removing lower support pillars first.
• DBy pulling exterior walls inward using nylon rope.

During demolition and floor detachment work, how must floor openings (such as removed staircase wells or hearth cutouts) be protected under OSHA 1926.502?

• ACovered with secured materials capable of supporting at least twice the maximum intended…
• BCovered with 1/4-inch cardboard panels taped at the perimeter.
• CMarked with yellow spray paint on the floor surface without structural covers.
• DSurrounded by single strand string lines positioned 12 inches above the floor.

According to OSHA 1926.852, when demolition materials or roof debris are dropped more than 20 feet to points outside the building, what equipment must be used?

• AAn entirely enclosed wooden or metal chute.
• BAn open wood slide with 4-inch side rails.
• CA heavy nylon cargo net suspended from roof rafters.
• DManual toss zones guarded by verbal spotters.

When preparing a slab-on-grade house for lifting, how are the steel needle beams inserted beneath the concrete floor slab?

• ACutting parallel trenches or slots through the slab and subgrade using diamond slab saws…
• BBreaking the entire slab into 6-inch rubble pieces with a jackhammer prior to lifting.
• CMelting the concrete subgrade using oxy-acetylene torches.
• DLifting the drywall ceiling to pull the slab up from above using cables.

Under EPA Section 608 regulations, what requirement must be met before disconnecting central air conditioning compressor units during house demolition or moving prep?

• ARefrigerant gases (such as R-410A or R-22) must be recovered by an EPA-certified technici…
• BRefrigerant lines must be cut cleanly with bolt cutters to vent gases to the atmosphere.
• CCompressor oil must be drained directly into the crawlspace soil.
• DAC units may be moved fully charged as long as line copper is bent in 90-degree elbows.

When a wood-frame house is lifted off a full concrete basement foundation that will remain backfilled, why must the basement walls be braced laterally before backfill earth is left unsupported?

• ARemoving the house floor diaphragm eliminates lateral top support, allowing backfill eart…
• BThe walls lose vertical bearing capacity as soon as the sill plate is removed.
• CThe top brace is needed only to prevent concrete shrinkage cracking.
• DThe backfill becomes weightless after the floor diaphragm is removed.

If an attached garage is demolished to reduce building width for a road permit, what must be done to the remaining shared house wall?

• AVerify structural load-bearing capacity, install temporary exterior weatherproofing, and…
• BLeave joist pockets open to allow air circulation through interior floor cavities.
• CSpray the exposed wall with water daily to keep wood framing moist.
• DRemove all vertical 2x4 studs along the common wall line.

Prior to excavating cribbing pits or driving ground anchors around a building foundation, what step is legally mandated under Arizona law?

• AContacting Arizona 811 (Blue Stake) at least two full working days prior to excavation to…
• BNotifying adjacent neighbors by registered mail 14 days in advance.
• CPerforming a soil core drilling test every 5 feet around the house perimeter.
• DPublishing a land survey map in the county register.

Why must extreme caution and specialized tendon-locating equipment (such as ground-penetrating radar) be used before saw-cutting slots in a post-tensioned concrete slab foundation?

• ASevering an energized high-strength steel post-tensioning tendon can release explosive ki…
• BPost-tensioned concrete emits toxic radon gas when cut by diamond blades.
• CCutting tendons permanently disables the house electrical grounding electrode loop.
• DTendon grease ignites spontaneously upon contact with diamond saw water.